Thumbs up [SOLVED] E: Can't mount /sdcard

Hello dear friends,
I had installed Carbon Kitkat rom on my device then try to undervolt it by Trickester mod but it crashed and phone started on a green screen and didn't boot up at all. I exprienced this green screen before, so I tried to go into recovery and install rom again. But this time when I go to Install Zip -> Choose zip from /sdcard recovery says: E: Can't mount /sdcard
and I can't do anything. Because E975 has insternal SD card I don't know how to fix it
Please help me what should I do?!